Figure 2. Gas evolution at a gold wire electrode immediately after turning on the voltage source. While a stream of gas is flowing upwards from the gold wire (left), only a weak gas evolution can be observed at the graphite electrode (right)

From

Electrochemical Synthesis of Coin Metal Nanoparticles in School Chemistry Education

Elena von Hoff, Stefanie Waitz, Felix Kollenda, Thomas Waitz

World Journal of Chemical Education. 2018, 6(1), 72-77 doi:10.12691/wjce-6-1-11